REACTIONS (GAMMA,2E) AND (E,3E) AS PROBES OF ELECTRONIC CORRELATIONS IN ATOMS

Cross sections of the (gamma,2e) and (e,3e) reactions carry informatio n on two vacancy energy spectrum and on electron pair correlations in initial and final states of the target atom. Physical pictures of thes e processes are presented for two- and many-electron atoms. Simplest m echanisms of them are discussed, demonstrating some features which are waiting for experimental confirmation. Attention is given to high pho ton energy and even to relativistic energy region of these reactions. The energy distribution of outgoing relativistic electrons is qualitat ively different from what it is for the nonrelativistic case. Origin a nd types of corrections to the simplest mechanisms and possible means of their detection are discussed. Role of different resonances: shape, giant, autoionizational, and Feschbach-type are considered. Results o f calculations are compared with experimental data, mainly on double p hotoionization cross sections. Different possible objects as targets f or the reactions are mentioned, including negative ions, excited atoms , molecules and clusters. Modification of the type of these reactions due to rather probable emission of the photon is discussed. Future of the domain is outlined.